| APA | DDOU. (2012, February 16). In Acronym Geek. Retrieved 06:06, February 16, 2012, from http://www.acronymgeek.com/DDOU |
| MLA | "DDOU." Acronym Geek. (2012). Acronym Geek. 16 Feb 2012 <http://www.acronymgeek.com/DDOU>. |
| MHRA | 'DDOU', Acronym Geek, 16 February 2012, <http://www.acronymgeek.com/DDOU> [accessed 16 February 2012] |
| Chicago | "DDOU", http://www.acronymgeek.com/DDOU (accessed February 16, 2012). |
| CBE/CSE | DDOU [Internet]. Acronym Geek; 2012 Feb 16 [cited 2012 Feb 16]. Available from: http://www.acronymgeek.com/DDOU. |
| Bluebook | DDOU, http://www.acronymgeek.com/DDOU (last visited February 16, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, DDOU, http://www.acronymgeek.com/DDOU (optional description here) (as of Feb. 16, 2012, 06:06). |
| AMA | DDOU. Acronym Geek. February 16, 2012, 06:06. Available at: http://www.acronymgeek.com/DDOU. Accessed February 16, 2012, 06:06. |